Sunan an-Nasa'i 5313
سنن النسائي#5313SahihIt was narrated from 'Umar that:He did not allow the wearing of silk except (something) the width of four fingers
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 48:274